Four new locks

Four more for the night desk

Caesar, a tiny cross, a letter matrix, and more hex. Still short.

Four for the first night

A cryptogram, a mini crossword, a letter matrix, and a hex dump. None of them long.

Fraction on the pad

Medium–hard. ADFGX. Five-by-five fractionated Morse-style grid, then the pairs as letters A D F G X.

Nihilist on the rail

Hard. Nihilist: Polybius numbers plus a repeating key. Key RAIL. I/J share.

Porta, star key

Medium. Porta cipher. Keyword STAR. Reciprocal alphabets; encode equals decode.

Running key, Standard

Hard. Running-key Vigenère. The key is THESTANDARD, letters only, no spaces in the key stream.

Trifid, good news

Hard. Trifid. 27-character alphabet A–Z plus a full stop, period 5.

Autokey from the rail

Hard. Autokey Vigenère. Primer RAIL, then the plaintext itself becomes the rest of the key. Spaces stripped.

Beaufort on the Gulf

Medium. Beaufort cipher, keyword STAR. Same operation encodes and decodes.

Bifid in the factory

Hard. Bifid cipher. Keyword TESLA, period 5, I/J share.