undecipherable

adj.

破译不出的，难辨认的；

Undecipherable abbreviations
Undecipherable codes, safe messages
Undecipherable abbreviations (letter)
'Undecipherable Signs': Margaret Laurence's 'To Set Our House in Order'
Undecipherable codes, secure messages. Alice, Bob and the meddler. Quantum cryptography.
Durable and undecipherable digital watermarking technique and detection of unauthorized use
Durable and undecipherable digital watermarking technique and detection of unauthorized use
Elucidating ‘undecipherable’ chemical structures using computer‐assisted structure elucidation approaches
Real-life kantei of swords, Part 2: Unslisted smiths and undecipherable inscriptions
Island, highland, and undecipherable blackness [microform]: natural landscape imagery in the novels of Robert Louis Stevenson