Some Protocols Off-the-Record Messaging https://otr.cypherpunks.ca/ https://otr.im/ https://github.com/otrv4/otrv4 TOTP: Time-Based One-Time Password Algorithm https://tools.ietf.org/html/rfc6238 HOTP: An HMAC-Based One-Time Password Algorithm https://tools.ietf.org/html/rfc4226 Double Ratchet https://signal.org/docs/specifications/doubleratchet/ PBKDF2 ZRTP Cryptography Libraries libsodium https://libsodium.gitbook.io/doc/ Bouncy Castle https://www.bouncycastle.org/ Crypto++ https://www.cryptopp.com/ pyca/cryptography https://cryptography.io/ Popular softwares that use cryptography Signal https://signal.org/ Zerotier https://www.zerotier.com/ WireGuard https://www.wireguard.com/ KeePass Password Safe https://keepass.info/ https://www.keepassx.org/ Keybase https://keybase.io/ miniLock https://github.com/kaepora/miniLock CipherShed https://www.ciphershed.org/ VeraCrypt https://www.veracrypt.fr/ Online Tools / Websites CyberChef https://gchq.github.io/CyberChef/ dCode.fr https://www.dcode.fr/en A Security Site https://asecuritysite.com/ CryptoParty https://www.cryptoparty.in/ RC4 NOMORE http://www.rc4nomore.com/ Guides EFF Surveillance Self-Defense https://ssd.eff.org/ EFF Panopticlick https://panopticlick.eff.org/ PRISM Break project https://prism-break.org/en/ Randomness True Random Number Service https://www.random.org NIST Interoperable Randomness Beacons https://csrc.nist.gov/projects/interoperable-randomness-beacons ANU Quantum Random Numbers Server https://qrng.anu.edu.au Random File Generate Commands dd if=/dev/random of=random.bin bs=1m count=1 dd if=/dev/urandom of=urandom.bin bs=1m count=1 Random password generator (JavaScript) https://www.nayuki.io/page/random-password-generator-javascript Hashing Hash Tools md5sum shasum sha1sum sha256sum HashTab http://implbits.com/products/hashtab/ Stop using MD-5, now! http://www.stopusingmd5now.com/ The first collision for full SHA-1 http://shattered.io/ http://shattered.io/static/shattered.pdf SHA-1 is a Shambles https://sha-mbles.github.io https://eprint.iacr.org/2020/014.pdf ';--have i been pwned? https://haveibeenpwned.com/ Most Used Passwords Lists https://github.com/danielmiessler/SecLists/tree/master/Passwords Tor Tor Project https://www.torproject.org Tor Metrics https://metrics.torproject.org Tails https://tails.boum.org/ How HTTPS and Tor Work Together to Protect Your Anonymity and Privacy https://www.eff.org/pages/tor-and-https SSL/TLS OpenSSL https://www.openssl.org/ Let’s Encrypt https://letsencrypt.org/ GOGETSSL https://www.gogetssl.com/ Qualys SSL Labs https://www.ssllabs.com/projects/ Ubuntu & Apache & SSL https://pastebin.com/N68VMscn Blockchain Do you need a blockchain? http://doyouneedablockchain.com/ https://eprint.iacr.org/2017/375.pdf Blockchain Demo https://andersbrownworth.com/blockchain/ Blockchain Demo https://blockchaindemo.io/ Bitcoin https://bitcoin.org/ Satoshi Nakamoto, ”Bitcoin: A Peer-to-Peer Electronic Cash System” https://bitcoin.org/bitcoin.pdf Bitcoin Block Explorer https://www.blockchain.com/explorer Ethereum https://ethereum.org/ State of the Dapps https://www.stateofthedapps.com/ Dappradar https://dappradar.com/ Learn to Code Blockchain DApps https://cryptozombies.io/ CryptoKitties https://www.cryptokitties.co/ Blockchain based file sharing https://blackhole.run/ Mail Groups / Resources Forums for discussing modern cryptographic practice https://moderncrypto.org/ Crypto Forum Research Group (CFRG) https://irtf.org/cfrg The International Association for Cryptologic Research (IACR) https://www.iacr.org/ Cryptology ePrint Archive https://eprint.iacr.org/ arXiv Cryptography and Security https://arxiv.org/list/cs.CR/recent Journal of Craptology :) http://www.anagram.com/jcrap/ Cryptographic competitions Cryptographic competitions https://competitions.cr.yp.to Advanced Encryption Standart (AES) https://csrc.nist.gov/Projects/cryptographic-standards-and-guidelines/Archived-Crypto-Projects/AES-Development https://web.archive.org/web/20011218002449/http://csrc.nist.gov/encryption/aes/index2.html eSTREAM: the ECRYPT Stream Cipher Project https://www.ecrypt.eu.org/stream/ Password Hashing Competition https://password-hashing.net/ SHA-3 https://csrc.nist.gov/projects/hash-functions/sha-3-project Post-Quantum Cryptography https://csrc.nist.gov/Projects/Post-Quantum-Cryptography Math and Crypto Puzzles/Challenges Project Euler https://projecteuler.net/ The Cryptopals Crypto Challenges https://cryptopals.com/ Underhanded Crypto Contest https://underhandedcrypto.com/